import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		int ans = 0;
		for (int i = 0; i < N; ++i) {
			char[] c = sc.next().toCharArray();
			for (char cs : c) {
				if (cs == 'W')
					++ans;
			}
		}
		System.out.println(ans);
	}

}